Hi again, Bill.
I worked last night and today on a new version of the module. Not only did I fix the bug for the and/or (which was your initial problem) I rewrote the model completely, allowing for a pretty complex filtering.
Now you can have multiple teachers, for instance, which will be handled with an OR condition (currently you can only have one teacher per study) but then have an AND condition for book or location or whatever.
Conditions within the same field are always OR but you choose between tables to use AND/OR.
Anyway - it's version 7.0.3 which you can find in the downloads area under 7.0 releases.
Tom